package com.qike.huadongexcel.config;

import com.alibaba.fastjson.JSONObject;
import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.exceptions.JWTVerificationException;
import com.qike.huadongexcel.mapper.ExcelProjectUserMapper;
import com.qike.huadongexcel.mapper.ExcelUserMapper;
import com.qike.huadongexcel.pojo.ExcelUser;
import com.qike.huadongexcel.response.RetResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sound.midi.Instrument;
import java.io.IOException;
import java.lang.reflect.Method;
import java.util.Map;

/**
 * @Author: Eric.zhou
 * @Date: 2019/9/5 10:19
 */
@CrossOrigin
public class AuthenticationInterceptor implements HandlerInterceptor {
    @Autowired
     private ExcelUserMapper userService;
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object object) throws Exception {
        if (httpServletRequest.getMethod()=="OPTIONS"){
            return true;
        }
//        String token = httpServletRequest.getParameter("token");
        String token = httpServletRequest.getHeader("token");// 从 http 请求头中取出 token
        // 如果不是映射到方法直接通过
        if(!(object instanceof HandlerMethod)){
            return true;
        }
        HandlerMethod handlerMethod=(HandlerMethod)object;
        Method method=handlerMethod.getMethod();
        //检查是否有passtoken注释，有则跳过认证
        if (method.isAnnotationPresent(PassToken.class)) {
            PassToken passToken = method.getAnnotation(PassToken.class);
            if (passToken.required()) {
                return true;
            }
        }else {
        // 执行认证
            if (token == null) {
//                return true;
                returnJson(httpServletResponse);
//                throw new RuntimeException("用户不存在，请重新登录");
                return false;
            }
            // 获取 token 中的 user id
            String userId;
            try {
                userId = JWT.decode(token).getAudience().get(0);
                System.out.println("userId 是+++"+userId);
            } catch (JWTDecodeException j) {
                returnJson(httpServletResponse);
//                throw new RuntimeException("用户不存在，请重新登录");
                return false;
            }
            ExcelUser user = userService.selectByPrimaryKey(Integer.valueOf(userId));
            if (user == null) {
                returnJson(httpServletResponse);
                throw new RuntimeException("用户不存在，请重新登录");
            }
            // 验证 token
            JWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(user.getPassWord())).build();
            try {
                jwtVerifier.verify(token);
            } catch (JWTVerificationException e) {
                returnJson(httpServletResponse);
                throw new RuntimeException("用户不存在，请重新登录");
            }
            return true;
        }
//        //检查有没有需要用户权限的注解
//        if (method.isAnnotationPresent(UserLoginToken.class)) {
//            UserLoginToken userLoginToken = method.getAnnotation(UserLoginToken.class);
//            if (userLoginToken.required()) {
//
//            }
//        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }

    private void returnJson(HttpServletResponse response) throws IOException {
        ServletOutputStream outputStream = null;
        response.setCharacterEncoding("UTF-8");
        response.setContentType("application/json; charset=utf-8");
        response.setStatus(HttpStatus.UNAUTHORIZED.value());
        try {
//            writer = response.getWriter();
//            writer.print(JSONObject.toJSON(RetResponse.makeRsp(401,"token错误")));

            outputStream = response.getOutputStream();
            String json = JSONObject.toJSONString(RetResponse.makeRsp(401,"token错误"));
            outputStream.write(json.getBytes());
            outputStream.flush();
            outputStream.close();
        } catch (IOException e){
        } finally {
            if(outputStream  != null){
                outputStream .close();
            }
        }
    }
}